It's quite a bit more than 150 fps.... My 18-2 4" has a 48 cylinder fitted and most .22 LR ammo is under 1000 fps....the Magnums are up in the 1400 range depending on the load. I get 1200+ from a High Standard Derringer.
Have had a bunch .22 LR revolvers fitted with .22 Magnum cylinders. A 1954 Colt Trooper .22 is at my smiths right now with an extra cylinder/crane assembly. The extra is being punched out to .22 Magnum after fitting. A friend did the same with a 4" Diamondback.
Have also done:
Model 63 with a Model 651 cylinder (x2)
Model 35 with a Model 51 cylinder
Model 17 with a Model 48 cylinder
Model 18 with a Model 48 cylinder
The bore from a .22 LR is .2225 and the .22 Magnum .224...with the pressure generated from a .22 Magnum does anyone really believe that this is going to be a pressure problem... Take a look at how much metal is in the cylinder wall of a NAA Mini-Revolver...
Freedom Arms, USFA and several others (not Ruger which is why their convertible Single-Sixs have lackluster accuracy with LRs) all use the .2225 bore size...they don't seem to have any problems...
Bob
...one of my all time favorite Smith .22ss,,,
Last edited by SuperMan; 09-05-2021 at 07:00 AM.
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